On April 26, 1995, a Cessna P210N (registration N4614K) was involved in an aviation accident near Dodge City, KS. Investigators recorded the probable cause as: The number one connecting rod failed due to fatigue originating from a decarburized layer on the shank of the rod. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced an engine explosion and power loss at 16,000 ft, descended through IMC, and made a forced landing in a field. Investigation found the number one connecting rod failed due to fatigue from a decarburized layer.
Accident Sequence
A pilot reported that while cruising at 16,000 feet mean sea level, a loud explosion was heard from the engine compartment, followed by a loss of engine power. The pilot descended through instrument meteorological conditions. Upon breaking out of the clouds, the airport was not in sight, and a forced landing was executed in a field.
Examination Findings
A Federal Aviation Administration inspector examined the wreckage and noted that the airplane was in a wet wheat field. Approximately 1,000 feet of ground scars led through a ditch to the wreckage. The inspector reported no evidence of preimpact airframe malfunction.
Engine Disassembly Findings
Disassembly of the engine revealed that the number one connecting rod had failed due to fatigue. The fatigue originated from a decarburized layer on the shank of the rod.
Probable cause
The number one connecting rod failed due to fatigue originating from a decarburized layer on the shank of the rod.